Passive Components


Heatsinks reduce hot spots

28 May 2008 Passive Components

Semiconductors in TO 220 and TO 218 case designs are usually secured to the selected heatsink by means of a screwed connection for the requisite cooling. This results in spot contact pressure in the area of the securing flap.

On the other hand, the contact pressure on the underside of the semiconductor, ie, where the primary heat is emitted, is lower. This in turn gives rise to an increased heat transmission resistance from the semiconductor to the heatsink in this area - so-called 'hot spots'.

The new contact pressure heatsinks in the AK 350 and AK 352 ranges from Alutronics are designed in such a way that when screw-connected, they distribute the contact pressure to the main heatsink across the entire surface of the underside of the semiconductor.

Dimensional tolerances on the part of the semiconductor casing are largely offset by the design of the heatsinks. In addition to optimising the contact pressure and reducing the contact resistance, these contact pressure heatsinks also provide additional cooling of the components across the top where the heatsinks can also be mounted as individual heatsinks.

The main application is in areas where safe assembly and optimised heat transmission from the semiconductor to the heatsink is required. The new heatsinks in the AK 350 and AK 352 ranges are designed for individual assembly as standard. Special dimensions are also available on request, for example for multiple assembly.



Credit(s)



Share this article:
Share via emailShare via LinkedInPrint this page

Further reading:

Thick-film chip resistors
29 April 2020, Electrocomp , Passive Components
Bourns announced the introduction of its new Model CR01005 series thick-film chip resistor. This extra small – 01005 inch (0402 metric) – CR01005 series broadens the general purpose thick-film chip resistor ...

Read more...
Automotive-grade MLCCs
29 April 2020, TRX Electronics , Passive Components
Yageo's automotive grade MLCC (multilayer chip capacitor) AC/AS series is AEC-Q200 qualified as well as MIL-STD-020D tested to ensure its reliability under various temperatures (from -55°C to +150°C) ...

Read more...
Chip resistors in automotive grade
29 May 2020, Altron Arrow , Passive Components
Vishay has enhanced its MC AT precision series of automotive grade thin film chip resistors with a wider range of resistance values from 47 Ω to 10 MΩ in the 1206 case size. The MCA 1206 AT is the industry’s ...

Read more...
Storage choke against harmonic distortion
29 April 2020, Würth Elektronik eiSos , Passive Components
The WE-LHMD is an SMT-mountable storage choke from Würth Elektronik optimised for filter topologies in Class-D amplifiers. Thanks to their iron powder cores, the high-current inductors for audio applications ...

Read more...
High-temperature shielded power inductors
29 April 2020 , Passive Components
The Bourns inductive components product line is introducing the Model SRP6030VA and SRP1040VA high-temperature shielded power inductors. These models are built with a new metal alloy powder formulation ...

Read more...
Passive components and subsystems for demanding applications
29 April 2020, Actum Group , Passive Components
Represented locally by Actum Group, Exxelia is a specialised manufacturer of high-quality Hi-Rel passive components and precision subsystems. Exxelia products meet complex specifications and cater for ...

Read more...
Storage choke for audio amplifiers
29 April 2020, Würth Elektronik eiSos , Passive Components
With WE-HIDA, Würth Elektronik offers a storage choke optimised for Class D amplifiers. The high-current inductor is characterised by low core losses, very low DC resistances from 2,5 mΩ to 14,8 mΩ and ...

Read more...
Radio interference suppression choke
29 April 2020, Würth Elektronik eiSos , Passive Components
Würth Elektronik is complementing its AEC-Q200 product group of qualified radio interference suppression chokes with an SMT-mountable model, the WE-RCIS. The rod core choke, available in four versions, ...

Read more...
Bypass capacitor kit for MMIC amplifiers
29 April 2020, RF Design , Passive Components
High-frequency MMIC amplifiers with broadband gain need to be protected from RF noise on the supply lines, particularly RF energy coupled back into the device from its output. Supply noise creates challenges ...

Read more...
Automotive grade aluminium capacitors
29 April 2020, Altron Arrow , Passive Components
Vishay introduced two new series of automotive grade, surface-mount aluminium electrolytic capacitors that combine high voltages up to 450 V with operating temperatures up to +125°C and useful life up ...

Read more...